<template>
    <div class="list" ref="wrapper">
        <!-- ref="wrapper"帮助获取DOM -->
        <div>
            <div class="area">
                <div class="title border-topbottom">当前城市</div>
                <div class="button-list">
                    <div class="button-wrapper">
                        <div class="button">北京</div>
                    </div>
                </div>
            </div>
            <div class="area">
                <div class="title border-topbottom">热门城市</div>
                <div class="button-list">
                    <div class="button-wrapper" v-for="item of hotCities" :key="item.id">
                        <div class="button">{{ item.name }}</div>
                    </div>
                </div>
            </div>
            <div class="area" v-for="(item, key) of cities" :key="key" :ref="key">
                <div class="title border-topbottom" >{{ key }}</div>
                <div class="item-list">
                    <div class="item border-bottom" v-for="innerItem of item" :key="innerItem.id">{{innerItem.name}}</div>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
import Bscroll from 'better-scroll'
export default {
  name: 'CityList',
  props: {
    hotCities: Array,
    cities: Object,
    letter: String
  },
  mounted () {
    this.scroll = new Bscroll(this.$refs.wrapper)
  },
  // 监听器点击右侧的字母，左侧兄弟组件跟随动
  watch: {
    letter () {
      if (this.letter) {
        const element = this.$refs[this.letter][0]

        this.scroll.scrollToElement(element)
      }
    }
  }
}
</script>
<style  lang="stylus" scoped>
    @import '~styles/varibles.styl'
    .border-topbottom
        &:before
            border-color #ccc
        &:after
            border-color #ccc
    .border-bottom
        &:before
            border-color #ccc
    .list
        overflow hidden
        position absolute
        top 1.58rem
        left 0
        right 0
        bottom 0
        .title
            line-height .54rem
            background #eeeeee
            padding-left .2rem
            color #666
            font-size .26rem
        .button-list
            overflow hidden
            padding .1rem .06rem .1rem .1rem
            .button-wrapper
                float left
                width 33.33%
                .button
                    padding .1rem
                    margin .1rem
                    text-align center
                    border .02rem solid $bgColor
                    border-radius .06rem
        .item-list
            .item
                line-height .76rem
                padding-left .2rem
</style>
